# A149980 (b-file synthesized from sequence entry)
0 1
1 2
2 5
3 17
4 55
5 190
6 699
7 2538
8 9573
9 36694
10 140881
11 552275
12 2175779
13 8624406
14 34558783
15 138884061
16 561597871
17 2284073680
18 9315683597
19 38180167051
20 157023821303
21 647586013452
22 2680241675239
23 11120381957470
24 46254888597609
25 192894174299418
26 806020664492243
27 3375225373534057